Vitamin B9

A deficiency in folic acid when the baby is in the embryonic phase can cause neurological defects.

For this reason, folic acid supplements are often recommended before conception and for at least the first three months of pregnancy.

Iron

Iron is mainly found in red blood cells where it helps carry oxygen to tissues. Your baby needs large amounts of iron, which is essential for building up his or her budding immune system.

Iron deficiency can lead to intense fatigue, trouble concentrating, irritability and a drop in immunity. Since your body’s iron requirements double during the first six months of pregnancy, you should take supplements as soon as you conceive. Iron is also indispensable in the weeks following the birth.

The body absorbs iron better if it is taken with vitamin C. Iron absorption is inhibited when you drink tea at the same time as you take the supplement.